CN111663192A - Device and method for controlling uniform stability of oil content of filament bundle during oiling of acrylic fibers - Google Patents

Abstract

The invention relates to the technical field of spinning, and discloses a device and a method for controlling the uniformity and stability of tow oil content when acrylic fibers are oiled, comprising a thick oil replenishing line, an oil circulation line, and an oil mother liquor conveying line connected in sequence according to the flow direction Line, conditioning oil tank, thin oil recovery line, conditioning tank; the oil circulation line is connected with the outlet of the preparation tank, and the oil mother liquor conveying line is provided with the return flow of the oil mother liquid to the conditioning tank The oil agent mother liquor conveying line is provided with an oil agent filter, an oil agent heater, a Coriolis mass flow controller and a differential pressure mass flow controller in sequence according to the flow direction. In the invention, a Coriolis mass flow controller and a differential pressure mass flow controller are connected in series before and after the oil agent mother liquor conveying line, and the combined control of the above two mass flow controllers can accurately and stably control the oil agent mother liquor The flow rate and the composition of the oiling agent busbar can be adjusted, so that the acrylic fiber can be oiled evenly and stably.

Description

A device and method for controlling the uniformity and stability of oil content in tow when acrylic fiber is oiled

technical field

The invention relates to the technical field of spinning, in particular to a device and a method for controlling the uniformity and stability of oil content in a tow when acrylic fibers are oiled.

Background technique

As we all know, in the process of chemical fiber spinning, oiling the fiber is an essential step. The reason is that the spinnability of chemical fibers is poor. When oiling, coating the surface of the fiber with spinning oil can make the fiber have good lubricating properties, excellent antistatic properties and a certain oil film strength, so that there is no lint in the fiber production process. , broken ends, reduce white powder, precipitates, etc. In addition, the spin finish also has a great influence on the post-spinning process of the fiber (including spinning, and then to the final fabric processing). In the spinning process of polyacrylonitrile fiber (acrylic fiber), oiling is also an essential process. Oiling can improve the spinnability, hand feeling, softness and elasticity of acrylic fiber, and make the spinning and post-spinning process smooth. It is an important step in the preparation of high-quality, high-performance acrylic fibers.

In fiber production, fiber oil content (also known as oil rate, that is, the mass ratio of fiber surface oil to dry oil-free fiber) is one of the important quality indicators, which has a great impact on fiber processing and quality. The control of fiber oil content plays an important role in fiber production. If the oil content of the fiber is too low, the surface of the silk cannot evenly form an oil film, the frictional resistance will increase, the bundling property will be poor, and it is easy to produce wool; if the oil content of the fiber is too high, the fiber will be sticky, making post-processing difficult. In the silk process, the oil content of the fiber must be controlled within an appropriate range. In the actual spinning process, the deviation range of the oil content of the fiber should be set according to the equipment conditions and production requirements, and the oil content of the fiber should be stably controlled within a certain range to prevent the oil content of the fiber from being significantly high or low. Oil unevenness. For example, the required fiber oil content is within the appropriate range of 0.3 to 0.4%, and the deviation range of the fiber oil content is set to ±0.075%. When the fiber oil content deviates from 0.3 to 0.4% and does not exceed ±0.075%, it can be regarded as The oiling is uniform; otherwise, the oil content of the fiber is significantly higher or lower, that is, the oiling is uneven.

The phenomenon of uneven oiling is reflected in different tows produced by different production lines and different spinning positions, and even different segments of the same tow. Uneven oiling between different segments of the same tow will cause tension fluctuations in the spinning process, increasing the breakage rate, and uneven oiling between different tows, which will lead to differences in performance and quality between tows. Therefore, uniform oiling is an important factor to ensure smooth spinning and post-processing and stable fiber product quality. In recent years, chemical fiber workers have established uniform and stable oil content as one of the efforts to continuously improve product quality, and have carried out a lot of work to study the factors that affect the oil content of tow and the control method for uniform and stable oil content of tow.

Combined with the immersion oiling method commonly used in wet spinning of acrylic fibers (due to the different production processes of acrylic fibers, the oiling methods will also be different. The advantage of immersion oiling is that the oil is evenly attached to the surface of the fiber), now The prior art adopts the oiling process as follows: the fiber tow enters the quenching and tempering oil tank for oiling, and after oiling, the oil in the quenching and tempering oil tank is sent back to the tempering tank for recycling. Since the fiber tow takes away a certain amount of oil after passing through the conditioning and oiling tank, the concentration of the oil in the tank will decrease, so the oil needs to be replenished. The concentrated oil is prepared to a certain concentration, and is metered and transported by the concentrated oil pump, merged with the oil flowing out of the conditioning tank, and then divided into two paths by the oil circulation pump. It can be seen that the oil that is continuously taken away by the tow in the oiling tank is supplemented by a certain concentration of oil mother liquor; the other way is to flow to the conditioning tank in the form of self-circulation to ensure that the conditioning tank The concentration of medium oil is uniform and stable, and the concentration of oil in the self-circulating pipeline is detected by an online refractometer.

In fact, controlling the oil content of tow to be uniform and stable is a complex problem, because there are many factors affecting the oil content of tow, involving equipment, technology and other aspects, and these factors are interrelated and affect each other. According to the engineering and technical personnel's many years of practical production experience, the main factors affecting the oil content of the fiber tow are the concentration of the oil agent in the quenching and tempering oil tank, the oil immersion effect of the fibers and the water content of the fibers entering and leaving the quenching and tempering oil tank. The effective control can ensure the uniform and stable fiber oil content. On the basis that the fiber has a certain oil immersion effect and the moisture content of the fiber in and out of the oil tank is stable, the concentration of the oil agent in the oil tank is a factor that affects the oil content of the fiber. The most important thing to control the oil content of the tow is to control the oil tank. Internal oil concentration. The main factors affecting the concentration of the oil in the oil tank are: the supply of the concentrated oil pump, the circulation of the oil circulation pump and the concentration of the oil mother liquor, among which the supply of the concentrated oil pump, the oil circulation pump The circulation volume is related to the stable and quantitative operation of the oil pump, which plays an important role in the stability of the oil concentration in the oil tank. question. In fact, the uneven oiling of fiber tows in the prior art is mostly caused by the oil pump: on the one hand, the oil pump is a gear pump, and its working mechanism is a gear that meshes with each other. When the oil pump rotates at a low speed To a certain extent, there will be obvious pulse conveying phenomenon, and the continuity of oil supply from the oil pump will become poor, resulting in uneven oiling; on the other hand, in the process of using the oil pump, some gears will be worn. , resulting in inaccurate measurement, and the difference in gear wear between different oil pumps will lead to measurement differences, resulting in differences in oiling of different production lines and spinning positions. In addition, in order to adjust the supply of the oil in the oil tank, the concentration of the oil mother liquid also has an important influence on the constant concentration of the oil in the oil tank. On the one hand, in the normal production process, controlling the stability of the oil mother liquid concentration ensures the adjustment For the stable supply of oil in the oil tank, when other influencing factors remain unchanged, the concentration of oil mother liquor has a decisive influence on the oil content of the fiber; The concentration of the mother liquor meets the new requirements for the oil content of the tow, or when the production is abnormal and the oil content of the tow does not meet the requirements during the sampling inspection, it is necessary to adjust the concentration of the oil agent mother liquor in time for normal production. Therefore, it is necessary to monitor the concentration of the oil agent mother liquor in real time in the production process, and the prior art is to use an online refractometer to detect the concentration of the oil agent mother liquor. The principle of the refractometer to measure the concentration of the solution is: according to the known correspondence between the concentration of the solution and the refractive index, the concentration of the solution is calculated by using the measured refractive index. However, temperature has an effect on the refractive index of a substance. In practice, refractometers are very sensitive to small changes in temperature, so the known relationship between solution concentration and refractive index is only valid for one given temperature, not others. . Therefore, the refractometer is best measured at the specified temperature. However, in actual use, the specified temperature is often not reached, so it is necessary to perform temperature correction on the measurement results. But only a few substances have temperature deviation coefficients or temperature deviation tables for temperature correction of the solution concentration values measured by the refractometer. In fact, the effect of temperature on the refractive index of different substances is different, and the existing temperature deviation coefficients or temperature deviation tables for temperature correction are not suitable for most other substances. Therefore, there is a deviation in the determination of the concentration of the oil agent mother liquor with a refractometer.

To sum up, although there are many factors that affect the oil content of the centripetal tow, the equipment is the most basic element. Through the improvement of the equipment, the mother liquor of the oil agent can be continuously replenished into the quenching and tempering oil tank at a constant flow rate and a certain concentration. It is the key, through the control of these factors, the uniform and stable control of the oil content of the tow during oiling can be ensured.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned technical problems, the present invention provides a device and method for controlling the uniformity and stability of oil content of tow when acrylic fiber is oiled. The pressure type mass flow controller can accurately and stably control the flow of the oil agent mother liquor and adjust the composition of the oil agent busbar through the joint control of the above two mass flow controllers, so that the acrylic fiber can be oiled evenly and stably.

The specific technical scheme of the present invention is as follows: a device for controlling the uniformity and stability of the oil content of the tow when the acrylic fiber is oiled, comprising a thick oil replenishing line, an oil circulation line, an oil mother liquor conveying line, a conditioning and tempering line connected in sequence according to the flow direction an oil tank, a thin oil recovery line, and a conditioning tank; the oil circulation line is connected with the outlet of the modulation tank, and the oil mother liquid conveying line is provided with an oil mother liquid return line flowing to the conditioning tank. An oil filter, an oil heater, a Coriolis mass flow controller and a differential pressure mass flow controller are sequentially arranged on the oil mother liquor conveying line according to the flow direction.

Preferably, the connection point of the oil agent mother liquor return line and the oil agent mother liquor conveying line is located upstream of the oil agent filter.

Preferably, a thick oil agent pump is provided on the thick oil agent replenishing line.

Preferably, an oil circulation pump is provided on the oil circulation line.

Preferably, the oil circulation pump is located downstream of the connection point between the rich oil replenishment line and the oil circulation line.

Preferably, the Coriolis mass flow controller and the differential pressure mass flow controller are devices with flow measurement components, flow adjustment components and signal transmission components, the response time of which is less than 0.1 seconds, and the lower limit of flow control is 0.1 kg /Time.

A method for controlling the uniformity and stability of oil content in tow when acrylic fiber is oiled, comprising: a thin oil agent flowing out from the lower part of a conditioning upper oil tank enters a conditioning tank, and oil flowing into the conditioning tank from an oil agent mother liquor return line Then it enters the oil circulation line and mixes with the concentrated oil from the concentrated oil supplement line; after mixing, it becomes the oil mother liquid and passes into the oil mother liquid conveying line, and part of the oil mother liquid is transported to the oil mother liquid The return line carries out a return circulation, and the remaining part passes through the oil filter, the oil heater, the Coriolis mass flow controller and the differential pressure mass flow controller in sequence, and then enters the quenching and tempering oil tank, and the oil in the oil tank is quenched and tempered. The agent is diluted, and the thinner oil enters the conditioning tank and enters the next cycle.

Wherein, through the reading of the Coriolis mass flow controller and the reading of the differential pressure mass flow controller, and after formula conversion, the mass flow rate of the oil agent mother liquor is calculated and determined, and the composition of the oil agent and moisture in the oil agent mother liquor is determined, and then according to the above As a result, the flow rate of the concentrated oil replenishment line and the oil circulation line can be controlled, thereby controlling the composition of the oil mother liquor.

The formula is:

Q _C = Q (1)

m _o +m _W = 1 (3)

in:

Q: Mass flow rate of oil agent mother liquor;

Q _C : flow reading of Coriolis mass flow controller;

Q _D : flow reading of differential pressure mass flow controller;

m _o : the mass fraction of the oil in the oil mother liquor;

m _W : the mass fraction of water in the mother liquor of the oil agent.

η _mix = η _mix (m _o , m _W ): the viscosity value of the oil agent mother liquor, is a function of m _o , m _W ;

η _L : the viscosity value of the liquid to be calibrated by the differential pressure mass flow controller;

ρ _mix = ρ _mix (m _o , m _W ): the density value of the oil agent mother liquor, which is a function of m _o and m _W ;

ρ _L : the density value of the liquid to be calibrated by the differential pressure mass flow controller;

In the formula, η _O and η _W are the viscosity of oil and water; _Mo and _MW are the molar masses of oil and water;

In the formula, ρ _o and ρ _W are the density of oil and water;

From the calculated mass flow rate of the oil agent mother liquor, the composition of the oil agent and water in the oil agent mother liquid, and the set value during oiling, the deviation between the calculated value and the set value is obtained, and the Coriolis mass flow controller is controlled by this deviation. , the flow rate of the thick oil replenishment line and the oil circulation line.

Preferably, the Coriolis mass flow controller has an accuracy of ±0.5%, the differential pressure mass flow controller has an accuracy of ±0.4%, and the maximum deviation of the oil agent mother liquor mass flow control is less than ±0.5%. The maximum deviation of mother liquor composition control is less than ±4%.

Preferably, the maximum deviation of the mass flow control of the oil agent mother liquor is less than ±0.3%, and the maximum deviation of the composition control of the oil agent mother liquor is less than ±1.2%.

Compared with the prior art, the beneficial effects of the present invention are: the present invention is connected in series with a Coriolis mass flow controller and a differential pressure mass flow controller before and after the oil agent mother liquor conveying line. The combined control of the acrylic fiber can accurately and stably control the flow of the oil agent mother liquor and adjust the composition of the oil agent busbar, so that the acrylic fiber can be oiled evenly and stably.

Description of drawings

Fig. 1 is the connection schematic diagram of the device of the present invention;

Fig. 2 is the flow measurement and control principle schematic diagram of Coriolis mass flow controller of the present invention;

3 is a schematic diagram of the flow measurement principle of the differential pressure mass flow controller of the present invention.

The reference signs are: concentrated oil replenishment line A, oil circulation line B, oil mother liquor conveying line C, thin oil recovery line D, oil mother liquor return line E, conditioning oil tank 1, conditioning tank 2. Oil filter 3, oil heater 4, Coriolis mass flow controller 5, differential pressure mass flow controller 6, concentrated oil pump 7, oil circulation pump 8.

Detailed ways

The present invention will be further described below in conjunction with the examples.

Example

A device for controlling the uniformity and stability of the oil content of the tow when the acrylic fiber is oiled, as shown in Figure 1, includes a thick oil agent replenishing line A, an oil agent circulation line B, an oil agent mother liquor conveying line C, a conditioning Quality oil tank 1, thin oil recovery line D, conditioning tank 2; the oil circulation line is connected with the outlet of the preparation tank, and the oil mother liquid conveying line is provided with the oil mother liquor flowing to the conditioning tank. Line E; an oil filter 3, an oil heater 4, a Coriolis mass flow controller 5 and a differential pressure mass flow controller 6 are arranged in sequence on the oil mother liquor conveying line according to the flow direction.

Wherein, the connection point of the oil agent mother liquor return line and the oil agent mother liquor conveying line is located upstream of the oil agent filter. The thick oil agent pump 7 is provided on the thick oil agent replenishing line. An oil circulation pump 8 is provided on the oil circulation line. The oil circulation pump is located downstream of the connection point between the rich oil replenishment line and the oil circulation line.

The Coriolis mass flow controller and the differential pressure mass flow controller are devices with flow measurement components, flow adjustment components and signal transmission components, the response time of which is less than 0.1 second, and the lower flow control limit is 0.1 kg/h.

A method for controlling the uniformity and stability of oil content in tow when acrylic fiber is oiled, comprising: a thin oil agent flowing out from the lower part of a conditioning upper oil tank enters a conditioning tank, and oil flowing into the conditioning tank from an oil agent mother liquor return line Then it enters the oil circulation line and mixes with the concentrated oil from the concentrated oil supplement line; after mixing, it becomes the oil mother liquid and passes into the oil mother liquid conveying line, and part of the oil mother liquid is transported to the oil mother liquid The return line carries out a return circulation, and the remaining part passes through the oil filter, the oil heater, the Coriolis mass flow controller and the differential pressure mass flow controller in sequence, and then enters the quenching and tempering oil tank, and the oil in the oil tank is quenched and tempered. The agent is diluted, and the thinner oil enters the conditioning tank and enters the next cycle.

Wherein, through the reading of the Coriolis mass flow controller and the reading of the differential pressure mass flow controller, and after formula conversion, the mass flow rate of the oil agent mother liquor is calculated and determined, and the composition of the oil agent and moisture in the oil agent mother liquor is determined, and then according to the above As a result, the flow rate of the concentrated oil replenishment line and the oil circulation line can be controlled, thereby controlling the composition of the oil mother liquor.

Wherein, the formula is:

Q _C = Q (1)

m _o +m _W = 1 (3)

in:

Q: Mass flow rate of oil agent mother liquor;

Q _c : flow reading of the Coriolis mass flow controller;

Q _D : flow reading of differential pressure mass flow controller;

m _o : the mass fraction of the oil in the oil mother liquor;

m _W : the mass fraction of water in the mother liquor of the oil agent.

η _mix = η _mix (m _o , m _W ): the viscosity value of the oil agent mother liquor, is a function of m _o , m _W ;

η _L : the viscosity value of the liquid to be calibrated by the differential pressure mass flow controller;

ρ _mix = ρ _mix (m _o , m _W ): the density value of the oil agent mother liquor, which is a function of m _o and m _W ;

ρ _L : The density value of the liquid to be calibrated by the differential pressure mass flow controller.

From the calculated mass flow rate of the oil agent mother liquor, the composition of the oil agent and water in the oil agent mother liquid, and the set value during oiling, the deviation between the calculated value and the set value is obtained, and the Coriolis mass flow controller is controlled by this deviation. , the flow rate of the thick oil replenishment line and the oil circulation line.

The accuracy of the Coriolis mass flow controller is ±0.5%, the accuracy of the differential pressure mass flow controller is ±0.4%, the maximum deviation of the mass flow control of the oil agent mother liquid is less than ±0.5%, and the composition control of the oil agent mother liquid The maximum deviation is less than ±4%. As a further preferred solution, the maximum deviation of the mass flow control of the oil agent mother liquor is less than ±0.3%, and the maximum deviation of the composition control of the oil agent mother liquor is less than ±1.2%.

As shown in Figure 2 (taking the "U" type vibrating tube Coriolis mass flow controller as an example), the measurement and control principle of the Coriolis mass flow controller is: all Coriolis mass flow control All devices are measured and controlled using the principle of Coriolis force proportional to the mass flow when the fluid flows in the vibrating tube, realizing high-precision direct flow measurement and control in the true sense. The driven measuring tube vibrates up and down in a sine wave manner, and the electromagnetic sensor can output a signal representing the sinusoidal motion of the measuring tube. When the fluid passes through the measuring tube, the generated Coriolis force deforms the two halves before and after the midpoint of the measuring tube in opposite directions, which creates a time difference Δt (sinusoidal motion signal phase difference) between the two sensors. When the mass flow increases, the degree of deformation of the measuring tube increases, and the time difference between the two sensors increases. Mass flow is determined by:

Q=k·Δt (4)

Among them, Q is the mass flow, k is the flow calibration coefficient, and Δt is the time difference, so that the direct measurement and control of the mass flow is realized. In summary, there are:

Q _C = Q (1)

where QC is the flow reading of the Coriolis mass flow controller, and _Q is the true mass flow of the oil mother liquor.

As shown in Figure 3, the working principle of the differential pressure mass flow controller is: after the turbulent flow in the pipeline enters the differential pressure flowmeter, the flow pattern becomes laminar flow. The measurement principle of the differential pressure flowmeter It is based on the linear relationship between the flow velocity and the pressure drop when the fluid flows laminarly in the flow channel. It can be described by the Poiseuille equation:

q=(P ₁ -P ₂ )πr ⁴ /8ηL=KΔP/η (5)

In the formula, K=πr ⁴ /8L (6)

Among them, q is the volume flow of the fluid _; P1 is the static pressure _of the fluid at the inlet of the flow channel, P2 is the static pressure of the fluid at the outlet of the flow channel; r is the equivalent radius of the flow channel; η is the absolute viscosity of the fluid; L is the Length of the runner.

For differential pressure flow meters, there are the following flow conversion formulas:

In the formula, q _D is the volume flow measurement value of the differential pressure flowmeter based on the calibration fluid; η _L is the viscosity of the calibration fluid; q is the real volume flow of the fluid; η _mix = η _mix (m _O , m _W ) is the viscosity value of the fluid, which is a function of _mo , _mW .

The liquid is an incompressible fluid, and its density is little affected by pressure, which is generally ignored. Before and after the liquid passes through the differential pressure flowmeter, the density can be considered as a constant, so there are:

In the formula, Q _D is the mass flow reading of the differential pressure flowmeter based on the calibration liquid; Q is the real mass flow of the liquid; ρ _L is the density of the calibration liquid; ρ _mix = ρ _mix (m _O , m _W ) is Density value of a liquid as a function of m _o , m _W.

According to the mixing rules, the viscosity η _mix of the oil agent mother liquor is:

lnn _mix = x _O ·lnn _O +x _W ·lnn _W (9)

In the _formula , _xO and xW are the mole fractions of oil and water, and _ηO and _ηW are the viscosity of oil and water. in:

In the formula, w _mix is the quality of the oil agent mother liquor, M _o and M _W are the molar masses of the oil agent and water, thus,

Because the molar masses M _o , MW and viscosity η _O , η _W of oil and water are constants, then the viscosity η _mix of the oil mother liquor is a function of the oil and water mass fractions m _O and m _W in the oil mother liquor _. ,Right now

According to the two-liquid theory, the volume of the oil mother liquor is:

In the formula, V _mix is the volume of the oil agent mother liquor, n _O , n _W are the amount of oil agent and moisture, V _m,O , V _m,W are the molar volumes of the oil agent and moisture, ρ _O , ρ _W is the density of oil and water. Thus, the density ρ _mix of the oil agent mother liquor has:

Since the densities ρ _O and ρ _W of oil and water are constants, the density ρ _mix of oil mother liquor is a function of oil and water mass fractions m _O and m _W in the oil mother liquor, that is,

Simultaneously: m _o +m _W = 1 (3)

The Coriolis mass flow controller reading Q _C and the differential pressure mass flow controller reading Q _D are sent to the computer, and the computer calculates and sends them to the oiling conditioning tank according to equations (1), (2), (3). The mass flow Q of the oil agent mother liquid and the composition m _o and m _W of the oil agent mother liquid, and these data are compared with the set conditions when oiling, and the Coriolis mass flow controller, the Coriolis mass flow controller, the Coriolis mass flow controller, The concentrated oil pump and the oil circulation pump can adjust the mass flow of the oil mother liquor sent to the oiling conditioning tank to be constant and the composition of the oil mother liquor to be constant, and finally control the oil content of the tow to be uniform and stable.

The raw materials and equipment used in the present invention, unless otherwise specified, are the common raw materials and equipment in the art; the methods used in the present invention, unless otherwise specified, are the conventional methods in the art.

The above are only preferred embodiments of the present invention and do not limit the present invention. Any simple modifications, changes and equivalent transformations made to the above embodiments according to the technical essence of the present invention still belong to the technical solutions of the present invention. scope of protection.

Claims (10)

1. A device for controlling the uniformity and stability of oil-containing tow during oiling of acrylic fibers, comprising a thick oil replenishing line (A), an oil circulation line (B), and an oil mother liquor conveying line (C) connected in sequence according to the flow direction , conditioning oil tank (1), thin oil recovery line (D), conditioning tank (2); the oil circulation line is connected with the outlet of the modulation tank, and the oil mother liquor conveying line is provided with a flow direction adjustment The oil agent mother liquor return line (E) of the quality tank; it is characterized in that: the oil agent mother liquor conveying line is sequentially provided with an oil agent filter (3), an oil agent heater (4), a Coriolis according to the flow direction Mass flow controller (5) and differential pressure mass flow controller (6). 2 . The device according to claim 1 , wherein the connection point of the oil agent mother liquor return line and the oil agent mother liquor conveying line is located upstream of the oil agent filter. 3 . 3. The device according to claim 1, characterized in that, a thick oil agent pump (7) is provided on the thick oil agent supplement line. 4. The device according to claim 1, characterized in that, an oil circulation pump (8) is provided on the oil circulation line. 5 . The apparatus of claim 4 , wherein the oil circulation pump is located downstream of the connection point between the rich oil replenishment line and the oil circulation line. 6 . 6. The apparatus according to claim 1, wherein the Coriolis mass flow controller and the differential pressure mass flow controller are devices having a flow measurement component, a flow adjustment component and a signal transmission component, which The response time is less than 0.1 seconds, and the lower limit of flow control is 0.1 kg/h. 7. A method for controlling the oil-containing uniform stability of the tow when the device described in one of claims 1-6 is used to control the oiling of the acrylic fiber, it is characterized in that comprising: the thin oil flowing out from the lower part of the upper oil tank for conditioning enters into the conditioning tank , merge with the oil agent mother liquid oil flowing into the conditioning tank from the oil agent mother liquid return line; then enter the oil agent circulation line and mix with the concentrated oil agent from the concentrated oil agent replenishment line; after mixing, it becomes the oil agent mother liquid and passes through Into the oil agent mother liquor conveying line, part of the oil agent mother liquor is transported to the oil agent mother liquor return line for reflux circulation, and the remaining part is sequentially passed through the oil agent filter, the oil agent heater, the Coriolis mass flow controller and the differential pressure mass flow controller. After the flow controller, it enters the conditioning oil tank, the oil in the conditioning oil tank is diluted, the thin oil enters the conditioning tank, and enters the next cycle; among them, the reading and differential pressure of the Coriolis mass flow controller are passed. The reading of the formula mass flow controller and the formula conversion are carried out to calculate and determine the mass flow rate of the oil agent mother liquid and the composition of the oil agent and water in the oil agent mother liquid, and then control the flow rate of the concentrated oil agent replenishment line and the oil agent circulation line according to the above results. , so as to control the composition of the oil mother liquor. 8. The method of claim 7, wherein the formula is: Q _C = Q

m _O +m _W =1 in: Q: Mass flow rate of oil agent mother liquor; Q _C : flow reading of Coriolis mass flow controller; Q _D : flow reading of differential pressure mass flow controller; m _O : the mass fraction of the oil in the oil mother liquor; m _W : the mass fraction of water in the mother liquor of the oil agent; η _mix = η _mix (m _O , m _W ): the viscosity value of the oil mother liquor, is a function of m _O , m _W ; η _L : the viscosity value of the liquid to be calibrated by the differential pressure mass flow controller; ρ _mix = ρ _mix (m _O , m _W ): the density value of the oil agent mother liquor, which is a function of m _O and m _W ; ρ _L : the density value of the liquid to be calibrated by the differential pressure mass flow controller;

In the formula, η _O and η _W are the viscosity of oil and water; _MO and _MW are the molar masses of oil and water;

In the formula, ρ _O and ρ _W are the densities of oil and water; From the calculated mass flow rate of the oil agent mother liquor, the composition of the oil agent and water in the oil agent mother liquid, and the set value during oiling, the deviation between the calculated value and the set value is obtained, and the Coriolis mass flow controller is controlled by this deviation. , the flow rate of the thick oil replenishment line and the oil circulation line. 9. The method according to claim 8, wherein the accuracy of the Coriolis mass flow controller is ±0.5%, the accuracy of the differential pressure mass flow controller is ±0.4%, and the quality of the oil agent mother liquor is ±0.5%. The maximum deviation of flow control is less than ±0.5%, and the maximum deviation of oil agent mother liquor composition control is less than ±4%. 10. The method according to claim 9, wherein the maximum deviation of the mass flow control of the oil agent mother liquor is less than ±0.3%, and the maximum deviation of the composition control of the oil agent mother liquor is less than ±1.2%.

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